GLASS FIBRE REINFORCED POLYMER REBARS

Abstract

Concrete is such a versatile material for its fire resistance and compressive strength, but it is too weak in tension area. As a solution for this the construction industry introduced steel rebars they are strong, inexpensive and have high ductility. However, steel’s vulnerability to corrosion costs governments and building owners a huge amount in maintenance costs to repair or replace aging infrastructure. In severe cases, corrosion can lead to structural failure and the loss of life. With advances in materials technology, many other materials are being adopted for use in reinforced concrete as a replacement of steel rebar. These include steel or carbon fibres, carbon fibre cables, glass fibre reinforced polymer (GFRP) rebar and even bamboo. Among these while considering cost and serviceability GFRP is a good option. GFRP rebar is made from a non-metallic material, which makes it resistant to corrosion also the polymer matrix in GFRP rebar provides a barrier against corrosion. Apart from that the glass fibres in GFRP rebar are corrosion resistant. Major cause of corrosion in steel is due to electro chemical reaction. Since GFRP rebar is non-magnetic and insulator that is also an advantage. In addition to the material property, it also possesses higher tensile strength, flexural strength etc. There are some other properties which require improvement including bond strength, stiffness etc.

GFRP rebar is a perfect substitute for steel but that doesn’t mean it can be suitable for every use. In high load applications and high-rise buildings steel is preferred. while in bridge construction, in concrete reinforcement and for buildings require light weight GFRP is a perfect solution. Further innovations ongoing in this area can replace steel in future.